Television antenna having v-shaped dipoles with arcuate parasitic elements

ABSTRACT

TELEVISION ANTENNA WHEREIN THE PARASITIC ELEMENTS COMPRISE AT LEAST TWO PARALLEL TUBE MEANS HAVING A CURVED CENTRAL PORTION AND TWO END PORTIONS, AND WHEREIN THE ACTIVE OR DRIVEN ELEMENTS COMPRISE A PLURALITY OF STRAIGHT ELEMENT PAIRS LYING IN A HORIZONTAL PLANE AND CONVERGING TOWARDS A POINT THAT LIES ON A LINE PARALLEL TO THE HORIZONTAL SYMMETRY AXIS OF SAID PARALLEL TUBE MEANS, THE ELEMENTS OF AT LEAST ONE ACTIVE ELEMENT PAIR BEING IN ALIGNMENT ALONG A DIRECTION THAT LIES AT A RELATIVELY SMALL ACUTE ANGLE TO THE DIRECTION OF SAID HORIZONTAL SYMMETRY AXIS OF SAID PARALLEL TUBE MEANS.

Feb. 9, 1971 P GOMEZ 3,562,754

TELEVISION ANTENNA H AVINb V-SHAPED DIPOLES W ARCUATE PARASITIC ELEMENTS Filed May 6, 1969 ITH FIE!

United States Patent O TELEVISION ANTENNA HAVING V-SHAPED DI- US. Cl. 343809 6 Claims ABSTRACT OF THE DISCLOSURE Television antenna wherein the parasitic elements comprise at least two parallel tube means having a curved central portion and two end portions, and wherein the active or driven elements comprise a plurality of straight element pairs lying in a horizontal plane and converging towards a point that lies on a line parallel to the horizontal symmetry axis of said parallel tube means, the elements of at least one active element pair being in alignment along a direction that lies at a relatively small acute angle to the direction of said horizontal symmetry axis of said parallel tube means.

FIELD OF THE INVENTION The invention relates to a television antenna and more particularly to a universal non directive antenna having an efiiciency and a power greater than those commonly used at present.

SUMMARY OF THE INVENTION The antenna according to the invention essentially comprises at least two parallel tubes lying in distinct horizontal planes spaced apart by a distance that is comparatively short against the length of said tubes, said tu'bes having a curved central portion and two end portions that are comparatively short against the length of the said central portion, said tubes serving as parasitic elements, and at least two active element pairs lying in a horizontal plane intermediate between the said horizontal planes of the parallel tubes, said active elements converging towards a point lying on a line parallel to the horizontal symmetry axis of said parallel tubes, the ends of said active elements adjacent to the said converging point beging connected to the antenna cable. The elements of the said active element pairs except one are in alignment along directions that lie at an acute angle to the direction of said horizontal symmetry axis of said parallel tubes.

According to an advantageous embodiment the curved central portion of the horizontal parallel tubes has the shape of a circular arc; the length of the end portions is substantially equal to one-eighth of the total length of said parallel tubes.

DESCRIPTION OF THE DRAWINGS The invention will be further described hereinafter with reference to the appended drawing wherein:

FIG. 1 is a perspective view of a first embodiment of the antenna according to the invention;

FIG. 2 is a plan view of the embodiment of FIG. 1;

FIG. 3 is a plan view of another embodiment of the antenna according to the invention.

DETAILED DESCRIPTION In FIG. 1 there is shown two parallel tubes 1 and 2 lying in two horizontal planes spaced apart by a distance comparatively short relative to the tube length, and two active or driven element pairs 5 and 6 lying in a horizontal plane intermediate to the planes of tubes 1 and "ice 2. The tubes 1 and 2, which serve as parasitic elements, as well as the active elements are advantageously made of hollow aluminum tubes. As seen more particularly in FIG. 2 the tubes 1 and 2 are shaped such as to exhibit a curved central portion 3 and two end portions 4 comparatively short relative to the central portion length. In an advantageous embodiment, the shape of the said central portion 3 is a circular arc; the length of the end portions 4 is substantially equal to one-eighth of the total length of said tubes 1 and 2.

The active elements are converging towards a point lying on a line parallel to the horizontal symmetry axis 8 of tubes 1 and 2. In the illustrative embodiment the convergence point is situated adjacent to the chord subtending the are which is the projection, in the active elements plane, of the curved central portion 3, inside the segment bounded "by said are and said chord. The elements 5a and 6a, on the one hand, and the elements 5b and 6b, on the other hand, are electrically interconnected at 9a and 9b. The second ends of the elements 5a and 6b are electrically coupled to the tubes 1 and 2 at points 10a and 10b which are arranged symmetrically relative to the projection, in the said intermediate horizontal plane, of the symmetry axis 8 of tubes 1 and 2 whereas the second ends of elements 6a and 6b are free. The elements 6a and 6b are in alignment along a direction that lies at an acute angle to the direction of axis 8. The antenna cable is connected to the ends 9a and 9b adjacent to the said convergence point of the active elements. The antenna described above may be fixed to a mast at 11.

In operation the antenna according to the invention captures the waves from any horizontal direction with an efliciency and a power which are much greater than those of the commonly used television receiving antennae having a plurality of elements. The antenna according.

to the invention is non directive and is able to capture any television channel, that is waves of any frequency. A single such antenna permits to have all the channels captured which are available at a partciular location.

The specific embodiment described is merely illustrative of the present invention. The antenna may be provided with a greater number of elements and particularly with a greater number of active element pairs.

FIG. 3 illustrates by way of example another embodiment of the antenna according to the invention which only differs from the first embodiment described in that it comprises three active element pairs. The elements 7a and 7b of the additional pair are also in alignment and the pairs 6a, 6b and 7a, 7b lie symmetrically relative to the center line 8. The antenna power and gain are in this way still greater. From the constructional point of view, the antenna according to the invention can be very easily mounted anywhere.

It is understood that various other arrangements are feasible without departing from the spirit and scope of the invention.

What I claim is:

1. A television antenna comprising at least two parallel tube means lying in distinct horizontal planes spaced apart by a distance that is comparatively short with respect to the length of said tube means, said tube means having a curved central portion and two end portions that are com paratively short with respect to the length of the said central portion, said tube means serving as parasitic elements, and at least two active element pairs lying in a horizontal plane intermediate between the said horizontal planes of said parallel tube means, said active elements converging towards a point lying on a line parallel to the horizontal symmetry axis of said parallel tube means, the elements of a first of said active element pairs having one end thereof electrically connected at two points that are coupled to said parallel tube means and that are arranged symmetrically relative to the said line parallel to said horizontal symmetry axis of said parallel tube means, the second end of each element of said first active element pair being electrically connected to one end of one element of each of the other of said active element pairs, the second ends of the elements of said other active element pairs being free, the elements pertaining to each of said other active element pairs being in alignment along directions that lie at a relatively small acute angle to the direction of said horizontal symmetry axis of said parallel tube means, an antenna cable being connected to the ends of said active elements which are adjacent to the said convergence point.

2. The television antenna of claim 1, wherein there is provided three active element pairs, the elements of two of said active element pairs having their ends opposite to said convergence point, free, and the elements of said two pairs being in alignment by, twos along directions that lie symmetrically relative to said horizontal symmetry axis of said parallel tube means.

3. The television antenna of claim 1, wherein the central portion of said horizontal parallel tube means has the shape of a circular arc.

4. The television antenna of claim 1, wherein the length of said end portions of said parallel tube means is sub- 4 stantially equal to one-eighth of the total length of said parallel tube means.

5. The television antenna of claim 1, wherein the connecting terminals of the antenna cable lie inside of the segment bounded by the arc which is the projection, in the active element plane, of the curved central portion of said parallel tube means, and the chord subtending said arc.

6. The television antenna of claim 1, wherein the connecting terminals of the antenna cable lie substantially on the chord subtending the are which is the projection, in the active element plane, of the curved central portion of said parallel tube means.

References Cited UNITED STATES PATENTS 3,245,082 4/1966 Rosenberry 343-803 3,389,395 6/1968 Lejkowski 343908 3,478,363 11/1969 Wells 343-908 ELI LIEBERMAN, Primary Examiner US. Cl. X.R. 

